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Dec 18, 2023 166 likes •423 views

Solar Cell Operation, Performance and Design Rules Utilization of Band Gap Energy Week 3.3.1 Arno Smets Design Rules Solar Cells 1. Bandgap Utilization Delicate Interplay 2. Spectral Utilization 3. Light Trapping Design Rules Solar Cells

SLIDE 1

Arno Smets

Solar Cell Operation, Performance and Design Rules

Utilization of Band Gap Energy

Week 3.3.1

SLIDE 2

2. Spectral Utilization

Design Rules Solar Cells

1. Bandgap Utilization
3. Light Trapping

Delicate Interplay

SLIDE 3

2. Spectral Utilization

Design Rules Solar Cells

1. Bandgap Utilization
3. Light Trapping

Delicate Interplay

SLIDE 4

2. Spectral Utilization

Design Rules Solar Cells

1. Bandgap Utilization
3. Light Trapping

Delicate Interplay

SLIDE 5

2. Spectral Utilization

Design Rules Solar Cells

1. Bandgap Utilization
3. Light Trapping

Delicate Interplay

SLIDE 6

p n EFn EFp qVoc

Band gap utilization

          1 ln J J q T k V

PH B OC

SLIDE 7

p n EFn EFp qVoc

Band gap utilization

          1 ln J J q T k V

PH B OC

Voc = 2kT q ln GLt 0 ni æ è ç ç ö ø ÷ ÷

SLIDE 8

Charge Carrier Recombination

Radiative Auger SRH

SLIDE 9

Charge Carrier Recombination

Shockley Read Hall 1 



t

N 

Voc = 2kT q ln GLt 0 ni æ è ç ç ö ø ÷ ÷

SLIDE 10

Charge Carrier Recombination

Radiative Auger SRH

SLIDE 11

Charge Carrier Recombination

Relectron = kn2p t e,Aug µ p R = 1 kn2 Rhole = kp2n t h,Aug µ n R = 1 kp2

SLIDE 12

Charge Carrier Recombination

Relectron = kn2p t e,Aug µ p R = 1 kn2 Rhole = kp2n t h,Aug µ n R = 1 kp2

SLIDE 13

Charge Carrier Recombination

SLIDE 14

Momentum Energy

Indirect band gap

photon phonon

SLIDE 15

Momentum Energy

Direct band gap

photon

SLIDE 16

Momentum Energy

Indirect band gap: c-Si

photon phonon

SLIDE 17

Momentum Energy

Direct band gap: GaAs

photon

SLIDE 18

Band gap utilization: .....the Voc is limited by

Radiative Auger SRH Defect-rich absorber layer

SLIDE 19

Band gap utilization: .....the Voc is limited by

Radiative Auger SRH Defect-free indirect band gap

SLIDE 20

Band gap utilization: .....the Voc is limited by

Radiative Auger SRH Defect-free direct band gap

SLIDE 21

Diffusion Length

Diffusion length: p-doped

Le= Det e < Lh

e h h h

L D L   

n-doped

+ + + + + + + + + + +

SLIDE 22

Minority carrier diffusion length

Ld

SLIDE 23

Relation between diffusion length and typical thickness of solar cells

Ld

SLIDE 24